Update README.
Update README.

fcruxen/passport-http-bearer,wejs/we-passport-http-bearer,colinskow/passport-http-bearer-sl,jaredhanson/passport-http-bearer,murdercdh/passport-http-bearer,gitterHQ/passport-http-bearer,ssqsignon/passport-ssqsignon,wwwslinger/passport-http-custom-bearer